KR20080075432A - Air Conditioning Equipment and Control Method - Google Patents

Abstract

An air conditioner according to the present invention includes a fan; A rotor for rotating the fan, a main winding for rotating the rotor by receiving current from a single-phase power source, an auxiliary winding for starting the rotor, and a capacitor for generating a phase difference between the main winding and the auxiliary winding; An induction motor; A phase detector for detecting phases of the main winding and the auxiliary winding; And a control unit controlling the induction motor to stop rotation when the difference between the phase of the main winding and the auxiliary winding detected by the phase detection unit is smaller than a reference value. Thus, by using the phase difference between the main winding and the auxiliary winding of the fan motor to directly detect whether there is a failure, it is possible to prevent unnecessary waste of power consumption.

Description

Air Conditioning Equipment and Control Method {Air Conditioner and Control Method Therof}

1 is a control block diagram of an air conditioner according to the present invention,

2 is a view showing a single phase induction motor according to the present invention,

3 is a control flowchart of the air conditioner according to the present invention.

* Explanation of symbols for main parts of the drawings

10: fan 20: induction motor

21: rotor 22: sovereign

23: auxiliary winding 24: condenser

25: power supply 26: centrifugal force switch

30: phase detection unit 40: control unit

50: power supply

The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner having a fan motor operated using a single-phase induction motor and a control method thereof.

In general, an air conditioner such as an air conditioner uses a fan motor implemented as a single-phase induction motor to suck / release external air. In the conventional air conditioner, the following method was performed to determine a fan motor failure.

For example, when the outdoor unit temperature is maintained for a long time above a predetermined temperature during the cooling operation, and the difference between the outdoor temperature and the outdoor unit temperature during the heating operation is a certain temperature or more, under the conditions at the time of the initial start of the heating compressor after a predetermined time after the compressor operation. The compressor is turned off, a fan abnormal signal of the outdoor unit is transmitted to the indoor unit, and the indoor outdoor unit is stopped.

When the fan stops, overcurrent flows to IPM (Intelligent Power Module). After stopping the compressor, it restarts after a few minutes. If the fan stops, the error is displayed and the indoor / outdoor operation is stopped.

The indirect detection method determines whether the fan is restrained by using indirect methods such as outdoor temperature, outdoor unit temperature, and compressor motor current, so that the current rises when the fan is stopped. There is a problem that can shorten the life, and waste unnecessary power consumption.

In addition, the conventional indirect detection method has a problem that it is not possible to determine whether the fan motor failure or other circuit portion failure.

Accordingly, an object of the present invention is to provide an air conditioner and a control method thereof, which can prevent unnecessary waste of power consumption by directly detecting whether a fault occurs by using a phase difference between a main winding and an auxiliary winding of a fan motor.

The object is, according to the present invention, an air conditioner comprising: a fan; A rotor for rotating the fan, a main winding for rotating the rotor by receiving current from a single-phase power source, an auxiliary winding for starting the rotor, and a capacitor for generating a phase difference between the main winding and the auxiliary winding; An induction motor; A phase detector for detecting phases of the main winding and the auxiliary winding; And a control unit for controlling the induction motor to stop rotation when the difference between the phase of the main winding and the auxiliary winding detected by the phase detection unit is less than a reference value.

Here, the reference value is preferably 90 degrees.

The phase detection unit may include a first phase detection unit detecting a phase of the main winding and a second phase detection unit detecting a phase of the auxiliary winding.

In addition, the controller may include a zero crossing circuit.

The apparatus may further include a power supply unit supplying power to the system, and the controller may turn off the power supply unit when the phase difference between the main winding and the auxiliary winding is smaller than the reference value.

On the other hand, the object is, according to the present invention, the main winding and the main winding for starting the rotor and the main winding for starting the rotor and the main winding and the main winding A control method of an air conditioner including an induction motor having a capacitor for generating a phase difference between the auxiliary windings, comprising: comparing whether a phase difference between the main winding and the auxiliary winding is smaller than a reference value; When the phase difference is less than the reference value can be achieved by a control method of the air conditioner comprising the step of stopping the rotation of the fan.

Here, the reference value is preferably 90 degrees.

The comparing of the phase difference with the reference value may include identifying a zero crossing point of the current induced by the main winding and the auxiliary winding.

The method may further include shutting off power supplied to the system when the phase difference is smaller than the reference value.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a control block diagram of an air conditioner according to the present invention, Figure 2a is a single-phase induction motor according to the present invention, Figure 2b is a view showing a phase detection circuit.

As shown in FIG. 1, an air conditioner according to the present invention includes a fan 10, an induction motor 20, a phase detector 30, and a controller 40 controlling the same.

The fan 10 rotates according to the operation of the induction motor 20 to be described later. For example, the fan 10 may be implemented as a blower fan provided in an outdoor unit for heat exchange in a compressor or an indoor unit for compressing the sucked air and discharging it to an exhaust port (not shown).

The induction motor 20 operates by applying a commercial power source to rotate the rotor with a magnetic field flowing in the winding. The induction motor according to the present invention is a single phase induction motor into which a current having one phase is introduced. Take one as an example.

As shown in FIG. 2A, the induction motor 20 according to the present invention is an example of a condenser divided induction motor that obtains a starting torque by inserting the capacitor 24 into the auxiliary winding 23 by direct current. In other words, the supply current in which the magnetic field is balanced by the current flowing through the main winding 22 in the absence of the condenser 24 is out of phase with the residual image current flowing by the condenser 24 inserted into the auxiliary winding 23. As the changed supply current flows through the winding, the equilibrium state of the electromagnetic force is broken to obtain starting torque.

The rotor 21 is a squirrel cage winding, and the stator (not shown) is wound around the driving winding which is the main winding 22 and the starting winding which is the auxiliary winding 23 in parallel, so that the single phase is connected to this parallel circuit. When an AC voltage is applied, a phase difference occurs in the current flowing through the two circuits due to the difference in reactance between the main winding 22 and the auxiliary winding 23, and a rotating magnetic field is generated to generate torque.

The centrifugal force switch 26 is connected in series with the start winding, and the switch is turned on at the beginning of the start, and when the speed of the rotor increases to reach 75% of the rated speed, the switch is turned off to open the start winding circuit. The motor will continue to rotate by the drive winding. In other words, the condenser 24 is required to obtain the starting torque by breaking the equilibrium state of the electromagnetic force (magnetic field) at the start. Then, when the rotor 21 starts to move and the speed rises to a fixed speed, the condenser 24 is separated and operated by the centrifugal force switch 26.

The phase detector 30 detects phases of the main winding 22 and the auxiliary winding 23 of the induction motor 20. In this case, the phase detection unit 30 may be implemented as a phase detection circuit. The phase detector 30 may be configured to detect phases of the main winding 22 and the auxiliary winding 23 in one phase detection unit, and may be configured to correspond to the main winding 22 and the auxiliary winding 23, respectively. It may be implemented by a phase detector (not shown) and a second phase detector (not shown).

Here, the phase detection unit 30 may be implemented as a phase detection circuit provided in each of the main winding 22 and the auxiliary winding 23 as shown in FIG. 2B.

At this time, the AC input power of the main winding 22 or the auxiliary winding 23 input through the input section 31 of the phase detection circuit is output through the output section 32 in a predetermined waveform through a predetermined process through the circuit. The controller 40 determines the phase difference of the output waveform of the phase detection circuit, and if it is determined that the phase difference between the main winding 22 and the auxiliary winding 23 is smaller than the reference value, the controller 40 determines that the fan motor has failed. The operation of (10) is stopped. Here, the control unit according to the present invention controls the operation of the phase difference calculation unit (not shown) and the operation unit 10 for calculating the phase difference between the main winding 22 and the auxiliary winding 23 according to the detection result of the phase detection unit. It may be implemented including a controller (not shown).

Under normal operation, the phase difference between the main winding 22 and the auxiliary winding 23 of the fan motor, which is a capacitor divided induction motor, is 90 degrees.

The phase difference calculation unit calculates a phase difference. The phase difference calculation unit of the air conditioner according to the present invention uses a zero-crossing circuit to retard the phase difference through the point where the phase of the current of the main winding 22 and the phase of the current of the auxiliary winding 23 pass through the zero point. It is taken as an example to calculate.

The operation controller determines that the fan motor is in a stopped state or an abnormal state when the phase difference calculated by the phase difference calculator is smaller than 90 °, the reference value, or there is no phase difference, and stops the operation of the fan 10.

On the other hand, the reference value of the phase difference that the control unit 40 determines the abnormal state of the fan motor may include a value of 90 ° or a range in which the normal operation can be performed according to an embodiment of the present invention.

In addition, the controller 40 may stop the fan 10 and notify the user that the fan motor is in an abnormal state when the phase difference is out of the reference value according to the calculation result of the phase difference calculator. At this time, the abnormal state may be known to the user through an alarm, OSD, LED light emission.

Meanwhile, the controller 40 may control the power supply unit 50 to turn off the power supplied to the system when an abnormal state of the fan motor is detected. For example, the controller 40 may control the power supply unit 50 to turn off the system power after a predetermined time elapses after the abnormal state of the fan motor is detected.

Hereinafter, with reference to Figure 3, the fan motor failure determination method of the air conditioning apparatus according to the present invention will be described in detail.

First, the phase detector 30 detects the phases of the main winding 22 and the auxiliary winding 23 of the induction motor 20, and the controller 40 calculates a phase difference between the main winding and the auxiliary winding through a zero crossing circuit ( S1).

According to an embodiment of the present invention, the induction motor 20 is a condenser divided motor, and the phase difference reference value between the main winding 22 and the auxiliary winding 23 is an example of 90 °.

Therefore, the controller 40 checks whether the phase difference between the main winding and the auxiliary winding is 90 ° (S3). If the value of the phase difference is less than 90 ° or there is no phase difference, the control unit 40 determines that the fan motor is broken and the fan 10 ) Is stopped (S5).

In addition, the controller 40 may stop the operation of the system by stopping the operation of the fan 10 and turning off the power supplied to the system after a predetermined time elapses.

Accordingly, the fault direct detection method of the fan motor according to the phase difference can distinguish between parts, single unit failures and unconnected parts of the fan motor, thereby providing an advantage in service.

On the other hand, according to an embodiment of the present invention, but the reference value of the phase difference is an example of 90 °, this is not limited and may be set to a value that allows the error range that the fan motor can operate normally.

In addition, the present invention is an example of an air conditioner using a fan motor, but this is not limited and may be applied to a system using an induction motor.

Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

As described above, according to the present invention, it is possible to prevent unnecessary waste of power consumption by directly detecting whether there is a failure by using the phase difference between the main winding and the auxiliary winding of the fan motor, and the stress applied to each power element of the air conditioning equipment. Provided are an air conditioner and a control method thereof, which can reduce the lifespan of each power device by reducing the power consumption.

Claims (9)

In the air conditioner, With a fan; A rotor for rotating the fan, a main winding for rotating the rotor by receiving current from a single-phase power source, an auxiliary winding for starting the rotor, and a capacitor for generating a phase difference between the main winding and the auxiliary winding; An induction motor; A phase detector for detecting phases of the main winding and the auxiliary winding; And a control unit controlling the induction motor to stop rotation when a difference between the phase of the main winding and the auxiliary winding detected by the phase detection unit is smaller than a reference value. The method of claim 1, And said reference value is 90 degrees. The method of claim 2, And the phase detection unit comprises a first phase detection unit detecting a phase of the main winding and a second phase detection unit detecting a phase of the auxiliary winding. The method of claim 1, And the control unit includes a zero crossing circuit. The method of claim 1, Further comprising a power supply for supplying power to the system, And the controller turns off the power supply unit when the phase difference between the main winding and the auxiliary winding is smaller than the reference value. A fan, a main winding for rotating the rotor by receiving current from a rotor and a single-phase power supply for rotating the fan, an auxiliary winding for starting the rotor, and a capacitor for generating a phase difference between the main winding and the auxiliary winding. In the control method of the air conditioning equipment including an induction motor provided, Comparing whether the phase difference between the main winding and the auxiliary winding is smaller than a reference value; Stopping the rotation of the fan when the phase difference is less than the reference value. The method of claim 6, And the reference value is 90 degrees. The method of claim 7, wherein Comparing whether the phase difference is smaller than the reference value, the method comprising the step of identifying the zero crossing point of the current induced by the main winding and the auxiliary winding. The method of claim 6, And cutting off the power supplied to the system when the phase difference is smaller than the reference value.

Images